We still have a little mayonnaise.
There is only one train per hour.
There is gold in his house as well as silver on his roof.
This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means have and so the verb version means to have. An alternative meaning is to exist though this refers only to non-living inanimate things, not moving and living things. So really, this is similar to "to have" as well.
These kanji aren't used too often, so when you're writing just use the kana. But you'll see the kanji used sometimes so it's important to be able to recognize them!
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:
To have something is very nice. But now, the only thing you possess are screams. Imagine this. You are in a totally empty room with no possessions. You open a little box and look inside. It contains screams that yell: "AAAAHHHH" (あ).